pritch Posted May 19, 2019 Share Posted May 19, 2019 (edited) Hi I'm not really sure what kind of pad stone I need for this rsj that is roughly 7m long and weighs around 650kg. The brickie said it's a standard concrete block size padstone I need? Thanks Edited May 19, 2019 by pritch Link to comment Share on other sites More sharing options...
Oz07 Posted May 19, 2019 Share Posted May 19, 2019 I might be missing it but can't see padstone size specced on there. Usually it is detailed. Ask SE Link to comment Share on other sites More sharing options...
nod Posted May 20, 2019 Share Posted May 20, 2019 As above I simply used 100 x 150 concrete lintels As I had a lot of them and the cost can soon rack up BC was absolutely fine with me cutting lintels into 400 lengths Link to comment Share on other sites More sharing options...
PeterW Posted May 20, 2019 Share Posted May 20, 2019 SE would need to spec this as there is too much missing info. For example, what’s the bearing material (dense block, lightweight block, brick..?) and what is the available end bearing ..? Given that is quite a chunky steel, you’ll be looking at Naylor 440x215x100 pad stones as a minimum I would expect. Have they specified any restraint method such as bolting ..?? Link to comment Share on other sites More sharing options...
Temp Posted May 20, 2019 Share Posted May 20, 2019 +1 You need to know the load on the beam (in Newton's) and the load bearing capability of the blocks in the wall (Newton's per square mm). Divide one by the other and you get the minimum area of the pad stones (in square mm). At least that's the theory. In practice it's more complicated. Calculating the load for example isn't simple. It's not just the weight of the beam! It's everything above it and some. Wind and possibly snow loading as well. There are also safety factors to be included. It's a job for your structural engineer. We have some narrow pillars between windows and our SE recommend denser blocks in those area because there was a limit on how big the padstone could be. Link to comment Share on other sites More sharing options...
pritch Posted May 25, 2019 Author Share Posted May 25, 2019 (edited) Hi I've just got back and looked at the email from the engineer. He said to lay it on a standard block size padstones on the single block course with the front plate resting on the face brick. I'm surprised to see the over hang of the steel is just 150mm each end. It doesn't seem a lot for a 7m rsj. Is this normal? Thanks Ps. That block with the cross on it above the steel. Would this be a cut down block or a timber wall plate? Edited May 25, 2019 by pritch Link to comment Share on other sites More sharing options...
Brickie Posted May 25, 2019 Share Posted May 25, 2019 43 minutes ago, pritch said: Would this be a cut down block or a timber wall plate? That’s a wall plate. Link to comment Share on other sites More sharing options...
pritch Posted May 25, 2019 Author Share Posted May 25, 2019 Ok thanks Would this be fixed some how or just bedded on ? Link to comment Share on other sites More sharing options...
PeterW Posted May 25, 2019 Share Posted May 25, 2019 30 minutes ago, pritch said: Ok thanks Would this be fixed some how or just bedded on ? Tek screws to hold that onto the RHS. Is that a flat roof above the steel..?? Link to comment Share on other sites More sharing options...
pritch Posted May 27, 2019 Author Share Posted May 27, 2019 On 25/05/2019 at 22:25, PeterW said: Tek screws to hold that onto the RHS. Is that a flat roof above the steel..?? Yes it's a flat roof. Link to comment Share on other sites More sharing options...
PeterW Posted May 27, 2019 Share Posted May 27, 2019 Just now, pritch said: Yes it's a flat roof. Ok makes sense ..! Was wondering how you’ve managed to get a 7m span with such a small steel ..!! Link to comment Share on other sites More sharing options...
pritch Posted May 28, 2019 Author Share Posted May 28, 2019 I'm still wondering if the 150mm minimum bearing should be increased ?? It doesn't seem alot for a 7m metre beam. Link to comment Share on other sites More sharing options...
PeterW Posted May 28, 2019 Share Posted May 28, 2019 You can make it as long as you want however you’ll have an issue with the flange showing through the front brick course if you’re not careful. It may also alter your padstone sizing. 1 Link to comment Share on other sites More sharing options...
pritch Posted May 31, 2019 Author Share Posted May 31, 2019 Just took delivery of the padstones. They have a raised edge ..... not sure if I should grind this off? Does the rsj really sit on a bed of compo ? This is what the builder said, though I can't really see it doing alot with 700kg on top. Link to comment Share on other sites More sharing options...
PeterW Posted May 31, 2019 Share Posted May 31, 2019 19 minutes ago, pritch said: Just took delivery of the padstones. They have a raised edge ..... not sure if I should grind this off? Does the rsj really sit on a bed of compo ? Don’t need to grind that off and yes, compo and slate to pack it level Link to comment Share on other sites More sharing options...
Oz07 Posted June 1, 2019 Share Posted June 1, 2019 Will be more of a smearing of compo than a full bed. If it helps you to think of it like that. Link to comment Share on other sites More sharing options...
bassanclan Posted June 1, 2019 Share Posted June 1, 2019 19 hours ago, PeterW said: Don’t need to grind that off and yes, compo and slate to pack it level You're not supposed to use slate packers now. If you have some scraps of plate steel use them instead. Link to comment Share on other sites More sharing options...
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